unsubstantiated

As adjectives the difference between unsubstantiated and substantial

is that unsubstantiated is lacking substantiation; without evidence while substantial is having to substance; actually existing; real; as, substantial life.

As a noun substantial is

anything having substance; an essential part.

As adjectives the difference between uncontested and unsubstantiated

is that uncontested is not contested or disputed; not made the object of competition while unsubstantiated is lacking substantiation; without evidence.

As adjectives the difference between unproven and unsubstantiated

is that unproven is not proved while unsubstantiated is lacking substantiation; without evidence.

As a verb substantiated

is (substantiate).

As an adjective unsubstantiated is

lacking substantiation; without evidence.

As adjectives the difference between baseless and unsubstantiated

is that baseless is of reasoning, that is based on something that is not true while unsubstantiated is lacking substantiation; without evidence.

As adjectives the difference between unsubstantiated and tentative

is that unsubstantiated is lacking substantiation; without evidence while tentative is of or pertaining to a trial or trials; essaying; experimental.

As a noun tentative is

a trial; an experiment.

As adjectives the difference between groundless and unsubstantiated

is that groundless is without any grounds to support it; baseless while unsubstantiated is lacking substantiation; without evidence.

As adjectives the difference between unsubstantiated and unverified

is that unsubstantiated is lacking substantiation; without evidence while unverified is not (yet) confirmed; not verified.

As adjectives the difference between unsubstantiated and inappropriate

is that unsubstantiated is lacking substantiation; without evidence while inappropriate is not appropriate; not suitable for the situation, time, and/or place.